Photochemistry of fluorinated compounds: reaction between FCO and CF3CF2 radicals

F.E. MALANCA; K.L. BIERBRAUER; M.S. CHIAPPERO; G.A. ARGÜELLO

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

Elsevier Science

Año: 2002 vol. 149 p. 9 - 13

1010-6030

CF3CF2C(O)F is a suitable source to generate the title radicals which can recombine to give back the precursor or lead to the formation of C4F10, CF2O and CO. We performed the photolysis of CF3CF2C(O)F pure and in the presence of c-C6H12 or (FCO)2 (oxalylfluoride), following the concentration of the different species by FTIR spectroscopy. The rate constant for the reaction CF3CF2 + FCO ->CF3CF2C(O)F was obtained through a simulation using both our experimental data and bibliography data available. The value found is (6.8 +/- 0.8)x10−12 cm3 molecule−1 s−1 and it is not substantially different from the rate constant (4.2 +/- 0.5)x10−12 cm3 molecule−1 s−1 obtained for the reaction of CF3 and FCO radicals. Thus, it was concluded that the length of the carbon chain does not affect the mechanism nor the rate constant value when it is compared with the CF3 + FCO system.